Server crash!

My server keeps stopping and i don't know why and besides this i lose all my settings (world,plugins,server settings).

Both of the answers took me back to the forum (the other 2 don't work for me except facebook/twitter thing, but seriously there is no way i could find the answer on facebook/twitter) anyway i will figure it out so don't worry.

Yes i did and the server managed to finally run , i decided to copy the world and make a new sv to be sure this won't happen and it looks like now it works even with the same plugins/world i had on the last server.

Anyway thanks for your help and i'm glad that my questions get answered in less than a day.